Vázquez Cuevas, Gabriela M., and Iván Ernesto Roldán Aragón. “Land-Cover Change Evaluation in the Reserve of the Biosphere Barranca De Metzilan, Hidalgo, Mexico (1973-2006)”. Geography Papers, no. 51-52, Dec. 2010, pp. 307-16, https://revistas.um.es/geografia/article/view/114601.